US8092924B2 - Triphenylene hosts in phosphorescent light emitting diodes - Google Patents

Triphenylene hosts in phosphorescent light emitting diodes Download PDF

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US8092924B2
US8092924B2 US11/443,586 US44358606A US8092924B2 US 8092924 B2 US8092924 B2 US 8092924B2 US 44358606 A US44358606 A US 44358606A US 8092924 B2 US8092924 B2 US 8092924B2
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triphenylene
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emissive layer
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Raymond Kwong
Bert Alleyne
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Universal Display Corp
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Definitions

  • the claimed invention was made by, on behalf of, and/or in connection with one or more of the following parties to a joint university corporation research agreement: Princeton University, The University of Southern California, and Universal Display Corporation. This agreement was in effect on and before the date the claimed invention was made, and the claimed invention was made as a result of activities undertaken within the scope of the agreement.
  • the present invention relates to organic light emitting devices (OLEDs), and specifically to phosphorescent organic materials used in such devices. More specifically, the present invention relates to triphenylene compounds incorporated into OLEDs.
  • Opto-electronic devices that make use of organic materials are becoming increasingly desirable for a number of reasons. Many of the materials used to make such devices are relatively inexpensive, so organic opto-electronic devices have the potential for cost advantages over inorganic devices. In addition, the inherent properties of organic materials, such as their flexibility, may make them well suited for particular applications such as fabrication on a flexible substrate. Examples of organic opto-electronic devices include organic light emitting devices (OLEDs), organic phototransistors, organic photovoltaic cells, and organic photodetectors. For OLEDs, the organic materials may have performance advantages over conventional materials. For example, the wavelength at which an organic emissive layer emits light may generally be readily tuned with appropriate dopants.
  • OLEDs organic light emitting devices
  • the wavelength at which an organic emissive layer emits light may generally be readily tuned with appropriate dopants.
  • organic includes polymeric materials as well as small molecule organic materials that may be used to fabricate organic opto-electronic devices.
  • Small molecule refers to any organic material that is not a polymer, and “small molecules” may actually be quite large. Small molecules may include repeat units in some circumstances. For example, using a long chain alkyl group as a substituent does not remove a molecule from the “small molecule” class. Small molecules may also be incorporated into polymers, for example as a pendent group on a polymer backbone or as a part of the backbone. Small molecules may also serve as the core moiety of a dendrimer, which consists of a series of chemical shells built on the core moiety.
  • the core moiety of a dendrimer may be a fluorescent or phosphorescent small molecule emitter.
  • a dendrimer may be a “small molecule,” and it is believed that all dendrimers currently used in the field of OLEDs are small molecules.
  • a small molecule has a well-defined chemical formula with a single molecular weight, whereas a polymer has a chemical formula and a molecular weight that may vary from molecule to molecule.
  • OLEDs make use of thin organic films that emit light when voltage is applied across the device. OLEDs are becoming an increasingly interesting technology for use in applications such as flat panel displays, illumination, and backlighting. Several OLED materials and configurations are described in U.S. Pat. Nos. 5,844,363, 6,303,238, and 5,707,745, which are incorporated herein by reference in their entirety.
  • OLED devices are generally (but not always) intended to emit light through at least one of the electrodes, and one or more transparent electrodes may be useful in organic opto-electronic devices.
  • a transparent electrode material such as indium tin oxide (ITO)
  • ITO indium tin oxide
  • a transparent top electrode such as disclosed in U.S. Pat. Nos. 5,703,436 and 5,707,745, which are incorporated by reference in their entireties, may also be used.
  • the top electrode does not need to be transparent, and may be comprised of a thick and reflective metal layer having a high electrical conductivity.
  • the bottom electrode may be opaque and/or reflective.
  • an electrode does not need to be transparent, using a thicker layer may provide better conductivity, and using a reflective electrode may increase the amount of light emitted through the other electrode, by reflecting light back towards the transparent electrode.
  • Fully transparent devices may also be fabricated, where both electrodes are transparent.
  • Side emitting OLEDs may also be fabricated, and one or both electrodes may be opaque or reflective in such devices.
  • top means furthest away from the substrate
  • bottom means closest to the substrate.
  • the bottom electrode is the electrode closest to the substrate, and is generally the first electrode fabricated.
  • the bottom electrode has two surfaces, a bottom surface closest to the substrate, and a top surface further away from the substrate.
  • a first layer is described as “disposed over” a second layer
  • the first layer is disposed further away from substrate.
  • a cathode may be described as “disposed over” an anode, even though there are various organic layers in between.
  • solution processible means capable of being dissolved, dispersed, or transported in and/or deposited from a liquid medium, either in solution or suspension form.
  • a first “Highest Occupied Molecular Orbital” (HOMO) or “Lowest Unoccupied Molecular Orbital” (LUMO) energy level is “greater than” or “higher than” a second HOMO or LUMO energy level if the first energy level is closer to the vacuum energy level.
  • IP ionization potentials
  • a higher HOMO energy level corresponds to an IP having a smaller absolute value (an IP that is less negative).
  • a higher LUMO energy level corresponds to an electron affinity (EA) having a smaller absolute value (an EA that is less negative).
  • the LUMO energy level of a material is higher than the HOMO energy level of the same material.
  • a “higher” HOMO or LUMO energy level appears closer to the top of such a diagram than a “lower” HOMO or LUMO energy level.
  • the present invention is directed to triphenylene compounds useful in phosphorescent organic light emitting diodes.
  • Specific examples include multi-aryl-substituted triphenylenes such as hexaryltriphenylenes, 1,1-bistriphenylenes, 2,2-bistriphenylenes, 1,12-fused-bistriphenylenes, 2,3-fused-tetratriphenylenes, and arylenetriphenylene triphenylenes.
  • the advantages are the high triplet energy, yet high ⁇ -conjugation. High efficiency and stability PHOLEDs with triphenylene hosts are demonstrated. Some high triplet energy analogs are expected to work with deep blue phosphorescent dopants.
  • the emissive layer includes a phosphorescent material and a triphenylene compound.
  • the triphenylene compound has an energy gap between the HOMO and the LUMO energy levels that is larger than the energy gap between the HOMO and the LUMO energy levels of the phosphorescent material.
  • the triphenylene compound in the emissive layer has an energy gap between its HOMO energy level and its LUMO energy level of at least about 1.8 eV.
  • the triphenylene compound has a highest occupied molecular orbital that is lower than the highest occupied molecular orbital of the phosphorescent material.
  • the triphenylene compound has a lowest unoccupied molecular orbital that is higher than the lowest unoccupied molecular orbital of the phosphorescent material.
  • the emissive layer comprises a phosphorescent material and a triphenylene compound wherein the triphenylene compound has the formula
  • each R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 and R 12 is independently H or a substituent selected from the group consisting of aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkyl, arylkyl heteroalkyl, alkenyl, and alkynyl and wherein the triphenylene compound has at least two substituents.
  • the triphenylene compound has a molecular weight of less than 1400.
  • At least one of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 and R 12 is selected from aryl and substituted aryl.
  • each of R 2 , R 3 , R 6 , R 7 , R 10 , and R 11 is selected from aryl and substituted aryl and in yet another embodiment, each of R 2 , R 3 , R 6 , R 7 , R 10 , and R 11 is selected from aryl and substituted aryl and R 2 , R 3 , R 6 , R 7 , R 10 , and R 11 are all the same.
  • the emissive layer comprises a phosphorescent material and a compound having a repeat unit, the repeat unit containing a triphenylene moiety.
  • the emissive layer comprises a phosphorescent material and a triphenylene compound having a benzotriphenylene structure.
  • the emissive layer comprises a phosphorescent material and a triphenylene compound having a fused-triphenylene structure
  • An organic electroluminescent device comprises an anode, a cathode, and an emissive layer comprising a triphenylene material and a phosphorescent material between the anode and the cathode.
  • the triphenylene material may be a fused triphenylene, a benzotriphenylene, or a triphenylene compound having the formula
  • R 1 -R 3 are each independently H or a substituent selected from the group consisting of, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkyl, arylkyl, heteroalkyl, alkenyl, and alkynyl.
  • the triphenylene compound has at least two substituents and a molecular weight of less than 1400.
  • an organic electroluminescent device comprising an anode, a cathode, and an emissive layer between the anode and the cathode, the emissive layer comprising a phosphorescent material and a compound having a repeat unit, the repeat unit containing a triphenylene moiety.
  • FIG. 1 shows an organic light emitting device having separate electron transport, hole transport, and emissive layers, as well as other layers.
  • FIG. 2 shows an inverted organic light emitting device that does not have a separate electron transport layer.
  • FIG. 3 shows luminous efficiency vs luminance of HPT: Ir(3-Mepq) 2 (acac) devices.
  • FIG. 4 shows current density vs voltage of HPT: Ir(3-Mepq) 2 (acac) devices.
  • FIG. 5 shows lifetime of HPT: Ir(3-Mepq) 2 (acac) devices
  • FIG. 6 shows luminous efficiency vs luminance of HPT: Ir(1-piq) 3 .
  • FIG. 7 shows current density vs voltage of HPT: Ir(1-piq) 3 devices.
  • FIG. 8 shows lifetime of HPT: Ir(1-piq) 3 devices.
  • FIG. 9 shows luminous efficiency vs luminance of Ir(5-Phppy) 3 devices
  • FIG. 10 shows current density vs voltage of Ir(5-Phppy) 3 devices.
  • FIG. 11 shows luminous efficiency vs luminance of 2,2-bistriphenylene (2,2-BT) Ir(3-Mepq) 2 (acac) devices.
  • FIG. 12 shows current density vs voltage of 2,2-BT: Ir(3-Mepq) 2 (acac).
  • FIG. 13 shows lifetime of 2,2-BT: Ir(3-Mepq) 2 (acac) devices.
  • FIG. 14 shows luminous efficiency vs luminance of 2,2-BT: Ir(1-piq) 3 devices
  • FIG. 15 shows current density vs voltage of 2,2-BT: Ir(1-piq) 3 devices.
  • FIG. 16 shows lifetime of 2,2-BT:Ir(1-piq) 3 devices.
  • FIG. 17 shows chemical structures for HPT, 2,2-BT; 1,1-BT 1,1-fused-BT; 1,12-fused TT; 2-vinyltriphenylene and 4 t-butyl-HPT.
  • FIG. 18 shows the 2,2-BT:Ir(pq) 2 (acac) device compositions.
  • FIG. 19 shows luminous efficiency vs luminance of 2,2-BT:Ir(pq) 2 (acac) devices.
  • FIG. 20 shows current density vs voltage of 2,2-BT:Ir(pq) 2 (acac) devices.
  • FIG. 21 shows EL and CIE of 2,2-BT:Ir(pq) 2 (acac) devices at 10 mA/cm 2 .
  • FIG. 22 shows lifetime of 2,2-BT:Ir(pq) 2 (acac) devices.
  • FIG. 23 shows luminous efficiency vs luminance of 2,2-BT:Ir(5-Phppy) 3 devices.
  • FIG. 24 shows current density vs voltage of 2,2-BT:Ir(5-Phppy) 3 devices.
  • FIG. 25 shows EL and CIE of 2,2-BT:Ir(5-Phppy) 3 devices at 10 mA/cm 2 .
  • FIG. 26 shows lifetime of 2,2-BT:Ir(5-Phppy) 3 devices
  • FIG. 27 shows the H1NT:Ir(pq) 2 (acac) and H2BT:Ir(3-Meppy) 3 device composition
  • FIG. 28 shows luminous efficiency vs luminance of H1NT:Ir(pq) 2 (acac) and H2BT:Ir(3-Meppy) 3 devices.
  • FIG. 29 shows current density vs voltage of H1NT:Ir(pq) 2 (acac) and H2BT:Ir(3-Meppy) 3 devices.
  • FIG. 30 shows EL and CIE of H1NT:Ir(pq) 2 (acac) and H2BT:Ir(3-Meppy) 3 devices at 10 mA/cm 2 .
  • FIG. 31 shows lifetime of H1NT:Ir(pq) 2 (acac) and H2BT:Ir(3-Meppy) 3 devices
  • an OLED comprises at least one organic layer disposed between and electrically connected to an anode and a cathode.
  • the anode injects holes and the cathode injects electrons into the organic layer(s).
  • the injected holes and electrons each migrate toward the oppositely charged electrode.
  • an “exciton,” which is a localized electron-hole pair having an excited energy state is formed.
  • Light is emitted when the exciton relaxes via a photoemissive mechanism.
  • the exciton may be localized on an excimer or an exciplex. Non-radiative mechanisms, such as thermal relaxation, may also occur, but are generally considered undesirable.
  • the initial OLEDs used emissive molecules that emitted light from their singlet states (“fluorescence”) as disclosed, for example, in U.S. Pat. No. 4,769,292, which is incorporated by reference in its entirety. Fluorescent emission generally occurs in a time frame of less than 10 nanoseconds.
  • Phosphorescence may be referred to as a “forbidden” transition because the transition requires a change in spin states, and quantum mechanics indicates that such a transition is not favored.
  • phosphorescence generally occurs in a time frame exceeding at least 10 nanoseconds, and typically greater than 100 nanoseconds. If the natural radiative lifetime of phosphorescence is too long, triplets may decay by a non-radiative mechanism, such that no light is emitted.
  • Organic phosphorescence is also often observed in molecules containing heteroatoms with unshared pairs of electrons at very low temperatures. 2,2′-bipyridine is such a molecule.
  • Non-radiative decay mechanisms are typically temperature dependent, such that an organic material that exhibits phosphorescence at liquid nitrogen temperatures typically does not exhibit phosphorescence at room temperature. But, as demonstrated by Baldo, this problem may be addressed by selecting phosphorescent compounds that do phosphoresce at room temperature.
  • Representative emissive layers include doped or un-doped phosphorescent organo-metallic materials such as disclosed in U.S. Pat. Nos. 6,303,238 and 6,310,360; U.S. Patent Application Publication Nos. 2002-0034656; 2002-0182441; 2003-0072964; and WO-02/074015.
  • the excitons in an OLED are believed to be created in a ratio of about 3:1, i.e., approximately 75% triplets and 25% singlets. See, Adachi et al., “Nearly 100% Internal Phosphorescent Efficiency In An Organic Light Emitting Device,” J. Appl. Phys., 90, 5048 (2001), which is incorporated by reference in its entirety.
  • singlet excitons may readily transfer their energy to triplet excited states via “intersystem crossing,” whereas triplet excitons may not readily transfer their energy to singlet excited states.
  • 100% internal quantum efficiency is theoretically possible with phosphorescent OLEDs.
  • Phosphorescence may be preceded by a transition from a triplet excited state to an intermediate non-triplet state from which the emissive decay occurs.
  • organic molecules coordinated to lanthanide elements often phosphoresce from excited states localized on the lanthanide metal.
  • such materials do not phosphoresce directly from a triplet excited state but instead emit from an atomic excited state centered on the lanthanide metal ion.
  • the europium diketonate complexes illustrate one group of these types of species.
  • Phosphorescence from triplets can be enhanced over fluorescence by confining, preferably through bonding, the organic molecule in close proximity to an atom of high atomic number. This phenomenon, called the heavy atom effect, is created by a mechanism known as spin-orbit coupling. Such a phosphorescent transition may be observed from an excited metal-to-ligand charge transfer (MLCT) state of an organometallic molecule such as tris(2-phenylpyridine)iridium(III).
  • MLCT excited metal-to-ligand charge transfer
  • triplet energy refers to an energy corresponding to the highest energy feature discernable in the phosphorescence spectrum of a given material.
  • the highest energy feature is not necessarily the peak having the greatest intensity in the phosphorescence spectrum, and could, for example, be a local maximum of a clear shoulder on the high energy side of such a peak.
  • organometallic refers to compounds which have an organic group bonded to a metal through a carbon-metal bond. This class does not include per se coordination compounds, which are substances having only donor bonds from heteroatoms, such as metal complexes of amines, halides, pseudohalides (CN, etc.), and the like.
  • organometallic compounds generally comprise, in addition to one or more carbon-metal bonds to an organic species, one or more donor bonds from a heteroatom.
  • the carbon-metal bond to an organic species refers to a direct bond between a metal and a carbon atom of an organic group, such as phenyl, alkyl, alkenyl, etc., but does not refer to a metal bond to an “inorganic carbon,” such as the carbon of CN or CO.
  • FIG. 1 shows an organic light emitting device 100 .
  • Device 100 may include a substrate 110 , an anode 115 , a hole injection layer 120 , a hole transport layer 125 , an electron blocking layer 130 , an emissive layer 135 , a hole blocking layer 140 , an electron transport layer 145 , an electron injection layer 150 , a protective layer 155 , and a cathode 160 .
  • Cathode 160 is a compound cathode having a first conductive layer 162 and a second conductive layer 164 .
  • Device 100 may be fabricated by depositing the layers described, in order.
  • Substrate 110 may be any suitable substrate that provides desired structural properties.
  • Substrate 110 may be flexible or rigid.
  • Substrate 110 may be transparent, translucent or opaque.
  • Plastic and glass are examples of preferred rigid substrate materials.
  • Plastic and metal foils are examples of preferred flexible substrate materials.
  • Substrate 110 may be a semiconductor material in order to facilitate the fabrication of circuitry.
  • substrate 110 may be a silicon wafer upon which circuits are fabricated, capable of controlling OLEDs subsequently deposited on the substrate. Other substrates may be used.
  • the material and thickness of substrate 110 may be chosen to obtain desired structural and optical properties.
  • Anode 115 may be any suitable anode that is sufficiently conductive to transport holes to the organic layers.
  • the material of anode 115 preferably has a work function higher than about 4 eV (a “high work function material”).
  • Preferred anode materials include conductive metal oxides, such as indium tin oxide (ITO) and indium zinc oxide (IZO), aluminum zinc oxide (AlZnO), and metals.
  • Anode 115 (and substrate 110 ) may be sufficiently transparent to create a bottom-emitting device.
  • a preferred transparent substrate and anode combination is commercially available ITO (anode) deposited on glass or plastic (substrate).
  • a flexible and transparent substrate-anode combination is disclosed in U.S. Pat. Nos.
  • Anode 115 may be opaque and/or reflective. A reflective anode 115 may be preferred for some top-emitting devices, to increase the amount of light emitted from the top of the device.
  • the material and thickness of anode 115 may be chosen to obtain desired conductive and optical properties. Where anode 115 is transparent, there may be a range of thickness for a particular material that is thick enough to provide the desired conductivity, yet thin enough to provide the desired degree of transparency. Other anode materials and structures may be used.
  • Hole transport layer 125 may include a material capable of transporting holes.
  • Hole transport layer 130 may be intrinsic (undoped), or doped. Doping may be used to enhance conductivity.
  • ⁇ -NPD and TPD are examples of intrinsic hole transport layers.
  • An example of a p-doped hole transport layer is m-MTDATA doped with F 4 -TCNQ at a molar ratio of 50:1, as disclosed in United States Patent Application Publication No. 2003-0230980 to Forrest et al., which is incorporated by reference in its entirety. Other hole transport layers may be used.
  • Emissive layer 135 may include an organic material capable of emitting light when a current is passed between anode 115 and cathode 160 .
  • emissive layer 135 contains a phosphorescent emissive material, although fluorescent emissive materials may also be used. Phosphorescent materials are preferred because of the higher luminescent efficiencies associated with such materials.
  • Emissive layer 135 may also comprise a host material capable of transporting electrons and/or holes, doped with an emissive material that may trap electrons, holes, and/or excitons, such that excitons relax from the emissive material via a photoemissive mechanism.
  • Emissive layer 135 may comprise a single material that combines transport and emissive properties.
  • emissive layer 135 may comprise other materials, such as dopants that tune the emission of the emissive material.
  • Emissive layer 135 may include a plurality of emissive materials capable of, in combination, emitting a desired spectrum of light. Examples of phosphorescent emissive materials include Ir(ppy) 3 . Examples of fluorescent emissive materials include DCM and DMQA. Examples of host materials in OLEDs include Alq 3 , CBP and mCP. Examples of emissive and host materials in OLEDs are disclosed in U.S. Pat. No. 6,303,238 to Thompson et al., which is incorporated by reference in its entirety.
  • preferred host materials include triphenylene complexes.
  • Triphenylene compounds are useful materials in other applications in OLEDs such as electron transporting materials as described in US US20050025993.
  • Emissive material may be included in emissive layer 135 in a number of ways.
  • an emissive small molecule may be incorporated into a polymer. This may be accomplished by several ways: by doping the small molecule into the polymer either as a separate and distinct molecular species; or by incorporating the small molecule into the backbone of the polymer, so as to form a co-polymer; or by bonding the small molecule as a pendant group on the polymer.
  • Other emissive layer materials and structures may be used.
  • a small molecule emissive material may be present as the core of a dendrimer.
  • a ligand may be referred to as “photoactive” if it contributes directly to the luminescent properties of an organometallic emissive material.
  • a “photoactive” ligand may provide, in conjunction with a metal, the energy levels from which and to which an electron moves when a photon is emitted.
  • Other ligands may be referred to as “ancillary.”
  • Ancillary ligands may modify the photoactive properties of the molecule, for example by shifting the energy levels of a photoactive ligand, but ancillary ligands do not directly provide the energy levels directly involved in light emission.
  • a ligand that is photoactive in one molecule may be ancillary in another.
  • Electron transport layer 145 may include a material capable of transporting electrons. Electron transport layer 145 may be intrinsic (undoped), or doped. Doping may be used to enhance conductivity. Alq 3 is an example of an intrinsic electron transport layer. An example of an n-doped electron transport layer is BPhen doped with Li at a molar ratio of 1:1, as disclosed in United States Patent Application Publication No. 2003-0230980 to Forrest et al., which is incorporated by reference in its entirety. Other electron transport layers may be used.
  • the charge carrying component of the electron transport layer may be selected such that electrons can be efficiently injected from the cathode into the LUMO (Lowest Unoccupied Molecular Orbital) energy level of the electron transport layer.
  • the “charge carrying component” is the material responsible for the LUMO energy level that actually transports electrons. This component may be the base material, or it may be a dopant.
  • the LUMO energy level of an organic material may be generally characterized by the electron affinity of that material and the relative electron injection efficiency of a cathode may be generally characterized in terms of the work function of the cathode material.
  • the preferred properties of an electron transport layer and the adjacent cathode may be specified in terms of the electron affinity of the charge carrying component of the ETL and the work function of the cathode material.
  • the work function of the cathode material is preferably not greater than the electron affinity of the charge carrying component of the electron transport layer by more than about 0.75 eV, more preferably, by not more than about 0.5 eV. Similar considerations apply to any layer into which electrons are being injected.
  • Cathode 160 may be any suitable material or combination of materials known to the art, such that cathode 160 is capable of conducting electrons and injecting them into the organic layers of device 100 .
  • Cathode 160 may be transparent or opaque, and may be reflective.
  • Metals and metal oxides are examples of suitable cathode materials.
  • Cathode 160 may be a single layer, or may have a compound structure.
  • FIG. 1 shows a compound cathode 160 having a thin metal layer 162 and a thicker conductive metal oxide layer 164 .
  • preferred materials for the thicker layer 164 include ITO, IZO, and other materials known to the art.
  • cathodes including compound cathodes having a thin layer of metal such as Mg:Ag with an overlying transparent, electrically-conductive, sputter-deposited ITO layer.
  • the part of cathode 160 that is in contact with the underlying organic layer, whether it is a single layer cathode 160 , the thin metal layer 162 of a compound cathode, or some other part, is preferably made of a material having a work function lower than about 4 eV (a “low work function material”).
  • Other cathode materials and structures may be used.
  • Blocking layers may be used to reduce the number of charge carriers (electrons or holes) and/or excitons that leave the emissive layer.
  • An electron blocking layer 130 may be disposed between emissive layer 135 and the hole transport layer 125 , to block electrons from leaving emissive layer 135 in the direction of hole transport layer 125 .
  • a hole blocking layer 140 may be disposed between emissive layer 135 and electron transport layer 145 , to block holes from leaving emissive layer 135 in the direction of electron transport layer 145 .
  • Blocking layers may also be used to block excitons from diffusing out of the emissive layer. The theory and use of blocking layers is described in more detail in U.S. Pat. No. 6,097,147 and United States Patent Application Publication No. 2003-0230980 to Forrest et al., which are incorporated by reference in their entireties.
  • blocking layer means that the layer provides a barrier that significantly inhibits transport of charge carriers and/or excitons through the device, without suggesting that the layer necessarily completely blocks the charge carriers and/or excitons.
  • the presence of such a blocking layer in a device may result in substantially higher efficiencies as compared to a similar device lacking a blocking layer.
  • a blocking layer may be used to confine emission to a desired region of an OLED.
  • injection layers are comprised of a material that may improve the injection of charge carriers from one layer, such as an electrode or an organic layer, into an adjacent organic layer. Injection layers may also perform a charge transport function.
  • hole injection layer 120 may be any layer that improves the injection of holes from anode 115 into hole transport layer 125 .
  • CuPc is an example of a material that may be used as a hole injection layer from an ITO anode 115 , and other anodes.
  • electron injection layer 150 may be any layer that improves the injection of electrons into electron transport layer 145 .
  • LiF/Al is an example of a material that may be used as an electron injection layer into an electron transport layer from an adjacent layer.
  • a hole injection layer may comprise a solution deposited material, such as a spin-coated polymer, e.g., PEDOT:PSS, or it may be a vapor deposited small molecule material, e.g., CuPc or MTDATA.
  • a solution deposited material such as a spin-coated polymer, e.g., PEDOT:PSS, or it may be a vapor deposited small molecule material, e.g., CuPc or MTDATA.
  • a hole injection layer may planarize or wet the anode surface so as to provide efficient hole injection from the anode into the hole injecting material.
  • a hole injection layer may also have a charge carrying component having HOMO (Highest Occupied Molecular Orbital) energy levels that favorably match up, as defined by their herein-described relative ionization potential (IP) energies, with the adjacent anode layer on one side of the HIL and the hole transporting layer on the opposite side of the HIL.
  • the “charge carrying component” is the material responsible for the HOMO energy level that actually transports holes. This component may be the base material of the HIL, or it may be a dopant.
  • a doped HIL allows the dopant to be selected for its electrical properties, and the host to be selected for morphological properties such as wetting, flexibility, toughness, etc.
  • Preferred properties for the HIL material are such that holes can be efficiently injected from the anode into the HIL material.
  • the charge carrying component of the HIL preferably has an IP not more than about 0.7 eV greater that the IP of the anode material. More preferably, the charge carrying component has an IP not more than about 0.5 eV greater than the anode material. Similar considerations apply to any layer into which holes are being injected.
  • HIL materials are further distinguished from conventional hole transporting materials that are typically used in the hole transporting layer of an OLED in that such HIL materials may have a hole conductivity that is substantially less than the hole conductivity of conventional hole transporting materials.
  • the thickness of the HIL of the present invention may be thick enough to help planarize or wet the surface of the anode layer. For example, an HIL thickness of as little as 10 nm may be acceptable for a very smooth anode surface. However, since anode surfaces tend to be very rough, a thickness for the HIL of up to 50 nm may be desired in some cases.
  • a protective layer may be used to protect underlying layers during subsequent fabrication processes.
  • the processes used to fabricate metal or metal oxide top electrodes may damage organic layers, and a protective layer may be used to reduce or eliminate such damage.
  • protective layer 155 may reduce damage to underlying organic layers during the fabrication of cathode 160 .
  • a protective layer has a high carrier mobility for the type of carrier that it transports (electrons in device 100 ), such that it does not significantly increase the operating voltage of device 100 .
  • CuPc, BCP, and various metal phthalocyanines are examples of materials that may be used in protective layers. Other materials or combinations of materials may be used.
  • protective layer 155 is preferably thick enough that there is little or no damage to underlying layers due to fabrication processes that occur after organic protective layer 160 is deposited, yet not so thick as to significantly increase the operating voltage of device 100 .
  • Protective layer 155 may be doped to increase its conductivity.
  • a CuPc or BCP protective layer 160 may be doped with Li.
  • FIG. 2 shows an inverted OLED 200 .
  • the device includes a substrate 210 , an cathode 215 , an emissive layer 220 , a hole transport layer 225 , and an anode 230 .
  • Device 200 may be fabricated by depositing the layers described, in order. Because the most common OLED configuration has a cathode disposed over the anode, and device 200 has cathode 215 disposed under anode 230 , device 200 may be referred to as an “inverted” OLED. Materials similar to those described with respect to device 100 may be used in the corresponding layers of device 200 .
  • FIG. 2 provides one example of how some layers may be omitted from the structure of device 100 .
  • FIGS. 1 and 2 The simple layered structure illustrated in FIGS. 1 and 2 is provided by way of non-limiting example, and it is understood that embodiments of the invention may be used in connection with a wide variety of other structures.
  • the specific materials and structures described are exemplary in nature, and other materials and structures may be used.
  • Functional OLEDs may be achieved by combining the various layers described in different ways, or layers may be omitted entirely, based on design, performance, and cost factors. Other layers not specifically described may also be included. Materials other than those specifically described may be used. Although many of the examples provided herein describe various layers as comprising a single material, it is understood that combinations of materials, such as a mixture of host and dopant, or more generally a mixture, may be used. Also, the layers may have various sublayers.
  • hole transport layer 225 transports holes and injects holes into emissive layer 220 , and may be described as a hole transport layer or a hole injection layer.
  • an OLED may be described as having an “organic layer” disposed between a cathode and an anode. This organic layer may comprise a single layer, or may further comprise multiple layers of different organic materials as described, for example, with respect to FIGS. 1 and 2 .
  • OLEDs comprised of polymeric materials (PLEDs) such as disclosed in U.S. Pat. No. 5,247,190, Friend et al., which is incorporated by reference in its entirety.
  • PLEDs polymeric materials
  • OLEDs having a single organic layer may be used.
  • OLEDs may be stacked, for example as described in U.S. Pat. No. 5,707,745 to Forrest et al, which is incorporated by reference in its entirety.
  • the OLED structure may deviate from the simple layered structure illustrated in FIGS. 1 and 2 .
  • the substrate may include an angled reflective surface to improve out-coupling, such as a mesa structure as described in U.S. Pat. No. 6,091,195 to Forrest et al., and/or a pit structure as described in U.S. Pat. No. 5,834,893 to Bulovic et al., which are incorporated by reference in their entireties.
  • any of the layers of the various embodiments may be deposited by any suitable method.
  • preferred methods include thermal evaporation, ink-jet, such as described in U.S. Pat. Nos. 6,013,982 and 6,087,196, which are incorporated by reference in their entireties, organic vapor phase deposition (OVPD), such as described in U.S. Pat. No. 6,337,102 to Forrest et al., which is incorporated by reference in its entirety, and deposition by organic vapor jet printing (OVJP), such as described in U.S. patent application Ser. No. 10/233,470, which is incorporated by reference in its entirety.
  • OVPD organic vapor phase deposition
  • OJP organic vapor jet printing
  • Other suitable deposition methods include spin coating and other solution based processes.
  • Solution based processes are preferably carried out in nitrogen or an inert atmosphere.
  • preferred methods include thermal evaporation.
  • Preferred patterning methods include deposition through a mask, cold welding such as described in U.S. Pat. Nos. 6,294,398 and 6,468,819, which are incorporated by reference in their entireties, and patterning associated with some of the deposition methods such as ink-jet and OVJD. Other methods may also be used.
  • the materials to be deposited may be modified to make them compatible with a particular deposition method. For example, substituents such as alkyl and aryl groups, branched or unbranched, and preferably containing at least 3 carbons, may be used in small molecules to enhance their ability to undergo solution processing.
  • Substituents having 20 carbons or more may be used, and 3-20 carbons is a preferred range. Materials with asymmetric structures may have better solution processibility than those having symmetric structures, because asymmetric materials may have a lower tendency to recrystallize. Dendrimer substituents may be used to enhance the ability of small molecules to undergo solution processing.
  • Devices fabricated in accordance with embodiments of the invention may be incorporated into a wide variety of consumer products, including flat panel displays, computer monitors, televisions, billboards, lights for interior or exterior illumination and/or signaling, heads up displays, fully transparent displays, flexible displays, laser printers, telephones, cell phones, personal digital assistants (PDAs), laptop computers, digital cameras, camcorders, viewfinders, micro-displays, vehicles, a large area wall, theater or stadium screen, or a sign.
  • PDAs personal digital assistants
  • Various control mechanisms may be used to control devices fabricated in accordance with the present invention, including passive matrix and active matrix. Many of the devices are intended for use in a temperature range comfortable to humans, such as 18 degrees C. to 30 degrees C., and more preferably at room temperature (20-25 degrees C.).
  • the materials and structures described herein may have applications in devices other than OLEDs.
  • other optoelectronic devices such as organic solar cells and organic photodetectors may employ the materials and structures.
  • organic devices such as organic transistors, may employ the materials and structures.
  • halo or “halogen” as used herein includes fluorine, chlorine, bromine and iodine.
  • alkyl as used herein contemplates both straight and branched chain alkyl radicals.
  • Preferred alkyl groups are those containing from one to fifteen carbon atoms and includes methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, and the like. Additionally, the alkyl group may be optionally substituted with one or more substituents selected from halo, CN, CO 2 R, C(O)R, NR 2 , cyclic-amino, NO 2 , and OR.
  • cycloalkyl as used herein contemplates cyclic alkyl radicals.
  • Preferred cycloalkyl groups are those containing 3 to 7 carbon atoms and includes cyclopropyl, cyclopentyl, cyclohexyl, and the like. Additionally, the cycloalkyl group may be optionally substituted with one or more substituents selected from halo, CN, CO 2 R, C(O)R, NR 2 , cyclic-amino, NO 2 , and OR.
  • alkenyl as used herein contemplates both straight and branched chain alkene radicals. Preferred alkenyl groups are those containing two to fifteen carbon atoms. Additionally, the alkenyl group may be optionally substituted with one or more substituents selected from halo, CN, CO 2 R, C(O)R, NR 2 , cyclic-amino, NO 2 , and OR.
  • alkynyl as used herein contemplates both straight and branched chain alkyne radicals. Preferred alkyl groups are those containing two to fifteen carbon atoms. Additionally, the alkynyl group may be optionally substituted with one or more substituents selected from halo, CN, CO 2 R, C(O)R, NR 2 , cyclic-amino, NO 2 , and OR.
  • heterocyclic group contemplates non-aromatic cyclic radicals.
  • Preferred heterocyclic groups are those containing 3 or 7 ring atoms which includes at least one hetero atom, and includes cyclic amines such as morpholino, piperdino, pyrrolidino, and the like, and cyclic ethers, such as tetrahydrofuran, tetrahydropyran, and the like.
  • aryl or “aromatic group” as used herein contemplates single-ring groups and polycyclic ring systems.
  • the polycyclic rings may have two or more rings in which two atoms are common by two adjoining rings (the rings are “fused”) wherein at least one of the rings is aromatic, e.g., the other rings can be cycloalkyls, cycloalkenyls, aryl, heterocycles and/or heteroaryls.
  • heteroaryl as used herein contemplates single-ring hetero-aromatic groups that may include from one to four heteroatoms, for example, pyrrole, furan, thiophene, imidazole, oxazole, thiazole, triazole, tetrazole, pyrazole, pyridine, pyrazine and pyrimidine, and the like.
  • heteroaryl also includes polycyclic hetero-aromatic systems having two or more rings in which two atoms are common to two adjoining rings (the rings are “fused”) wherein at least one of the rings is a heteroaryl, e.g., the other rings can be cycloalkyls, cycloalkenyls, aryl, heterocycles and/or heteroaryls.
  • the present invention is directed to an organic emissive layer comprising a phosphorescent material and a triphenylene compound, as well as a device including such an emissive layer.
  • Specific triphenylene compounds are also provided.
  • the organic emissive layer includes a phosphorescent material and a triphenylene compound, optionally substituted.
  • the substituents may be the same or different and each is selected from the group consisting of alkyl, aryl, substituted aryl, alkenyl, alkynyl, and heteroalkyl.
  • Particularly preferred are triphenylene compounds having a molecular weight of less than 1400 that can be evaporated at vacuum without decomposition. High efficiency and lifetime are demonstrated by devices fabricated according to the present invention.
  • the high triplet energy of triphenylene renders triphenylene compounds particularly suitable as hosts or co-hosts for use with deep blue phosphorescent dopants.
  • Triphenylene is a polyaromatic hydrocarbon with a high triplet energy and a relatively small energy difference between the first singlet and first triplet levels. This would indicated that triphenylene has relatively easily accessible HOMO and LUMO levels compared to other aromatic compounds with similar triplet energy (e.g., biphenyl).
  • the advantage of using triphenylene and its derivatives as hosts is that it can accommodate red, green and even blue phosphorescent dopants to give high efficiency without energy quenching.
  • the triphenylene compound in the present invention has an energy gap between the HOMO and the LUMO energy levels that is larger than the energy gap between the HOMO and the LUMO energy levels of the phosphorescent material.
  • the triphenylene compound in the present invention has an energy gap between its HOMO energy level and its LUMO energy level of at least about 1.8 eV.
  • the triphenylene compound has a highest occupied molecular orbital that is lower than the highest occupied molecular orbital of the phosphorescent material.
  • the triphenylene compound has a lowest unoccupied molecular orbital that is higher than the lowest unoccupied molecular orbital of the phosphorescent material.
  • the present invention provides an organic emissive layer comprising a phosphorescent material and a triphenylene compound, as well as a device including said emissive layer, wherein the triphenylene compound comprises a multi-aryl-substituted triphenylene, preferably 2,3,6,7,10,11-hexaaryltriphenylene having the structure:
  • R 2 , R 3 , R 6 , R 7 , R 10 and R 11 is each independently H or a substituent selected from the group consisting of aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkyl, arylkyl, heteroalkyl, alkenyl, and alkynyl; and wherein the triphenylene compound has at least two substituents.
  • R 2 , R 3 , R 6 , R 7 , R 10 and R 11 may all be the same or they may be different.
  • each of R 2 , R 3 , R 6 , R 7 , R 10 and R 11 is selected from aryl and substituted aryl
  • at least one of R 2 , R 3 , R 6 , R 7 , R 10 and R 11 is selected from aryl and substituted aryl.
  • Preferred multi-aryl-substituted triphenylene compounds are those that can be evaporated at vacuum without decomposition. Examples include but are not limited to compounds where R 2 , R 3 , R 6 , R 7 , R 10 and R 11 are phenyl, naphthyl and biphenyl as shown by the following structures:
  • R 2 , R 3 , R 6 , R 7 , R 10 and R 11 are all substituted phenyl.
  • Such an example includes but is not limited to a compound having the structure
  • the present invention provides an organic emissive layer comprising a phosphorescent material and a compound having a repeating unit containing a triphenylene moiety, as well as a device including said emissive layer.
  • Ar is selected from aryl and substituted aryl
  • X is 1-3;
  • Y is 1-3 and
  • n 1-3
  • a preferred arylenetriphenylene is phenylenetriphenylene having the structure
  • X is 1-3;
  • Y is 1-3 and
  • n 1-3.
  • More preferred arylenetriphenylene compounds are those that can be evaporated at vacuum without decomposition. Examples include but are not limited to:
  • triphenylenylene compounds are oligo(triphenylenylene) where n ⁇ 5. More preferred are triphenylenylene compounds that can be evaporated at vacuum without decomposition. Examples include but are not limited to:
  • R 1 , R 2 , and R 3 is each independently selected from the group consisting H, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkyl, arylkyl, heteroalkyl, alkenyl, and alkynyl.
  • R 1 R 2 R 3 and R′ is each independently selected from the group consisting of, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkyl, arylkyl, heteroalkyl, alkenyl, and alkynyl.
  • the present invention provides an organic emissive layer comprising a phosphorescent material and a triphenylene compound, as well as a device including said emissive layer, wherein the triphenylene compound has a multi-benzotriphenylene structure.
  • Preferred multi-benzotriphenylenes are those that can be evaporated at vacuum without decomposition. Examples include but are not limited to:
  • the present invention provides an organic emissive layer comprising a phosphorescent material and a triphenylene compound, as well as a device including said emissive layer, wherein the triphenylene compound has a fused-triphenylenylene structure.
  • Preferred fused-triphenylenylene structures include but are not limited to
  • CBP 4,4′-N,N-dicarbazole-biphenyl m-MTDATA 4,4′,4′′-tris(3-methylphenylphenlyamino)triphenylamine Alq 3 : 8-tris-hydroxyquinoline aluminum
  • Bphen 4,7-diphenyl-1,10-phenanthroline
  • n-BPhen n-doped BPhen (doped with lithium)
  • F 4 -TCNQ tetrafluoro-tetracyano-quinodimethane
  • p-MTDATA p-doped m-MTDATA (doped with F 4 -TCNQ)
  • Ir(ppy) 3 tris(2-phenylpyridine)-iridium
  • Ir(ppz) 3 tris(1-phenylpyrazoloto,N,C(2′)iridium(III)
  • BCP 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline
  • TAZ
  • ITO indium tin oxide
  • NPD N,N′-diphenyl-N-N′-di(1-naphthyl)-benzidine
  • TPD N,N′-diphenyl-N-N′-di(3-toly)-benzidine
  • BAlq aluminum(III)bis(2-methyl-8-hydroxyquinolinato)4- phenylphenolate
  • mCP 1,3-N,N-dicarbazole-benzene
  • DCM 4-(dicyanoethylene)-6-(4-dimethylaminostyryl-2-methyl)-4H-pyran
  • DMQA N,N′-dimethylquinacridone
  • PEDOT PSS: an aqueous dispersion of poly(3,4-ethylenedioxythiophene) with polystyrenesulfonate (PSS) HPT: 2,3,6,7,10,11-hexaphenyltriphenylene 2,7-DCP 2,7-N,N-dicarbazol
  • 2,3,6,7,10,11-Hexabromotriphenylene was prepared according to the literature method (Breslow et al, Tetrahedron, 1982, 38, 863).
  • Triphenylene (3.0 g, 13.2 mmol) was dissolved in 70 mL of nitrobenzene. 0.27 g of Fe powder was added.
  • bromine (18.6 g, 120 mmol) in 20 mL of nitrobenzene was added via a dropping funnel. The mixture was stirred at room temperature for 12 hours and brought to reflux for 2 hours. After cooling, the solid was filtered, washed with ethanol and dried. 8.9 g (96%) of crude product was obtained. Recrystallization in boiling 1,2-dichlorobenzene ( ⁇ 180° C.) yielded the product as off-white needles (8.64 g, 94%). The product was confirmed by mass spectrometry.
  • 2,3,6,7,10,11-hexabromotriphenylene (8.64 g, 12.3 mmol), 4-t-butylphenylboronic acid (13.5 g, 111 mmol), triphenylphosphine (0.64 g, 2.46 mmol), Pd(OAc) 2 (0.14 g, 0.615 mmol), K 2 CO 3 (20.4 g, 147.6 mmol) were in 600 mL of xylenes and 50 mL of water. The mixture was purged with nitrogen for 5 minutes and slowly brought to reflux under nitrogen.
  • the aqueous layer was removed and the organic layer was washed with water.
  • the organic layer was dried over magnesium sulphate and then the solvent removed in vacuo.
  • the product was purified using column chromatography with dichlormethane/hexanes (50/50) as the mobile phase.
  • the mixture was then refluxed for 24 hours in a nitrogen atmosphere.
  • the reaction was then allowed to cool and the contents transferred to a separatory funnel.
  • the aqueous layer was removed and the organic layer was washed with water.
  • the organic layer was dried over magnesium sulphate and then the solvent removed in vacuo.
  • the product was purified using column chromatography with dichlormethane:hexanes (50:50) as the mobile phase.
  • the mixture was then refluxed for 24 hours in a nitrogen atmosphere.
  • the reaction was then allowed to cool and the contents transferred to a separatory funnel.
  • the aqueous layer was removed and the organic layer was washed with water.
  • the organic layer was dried over magnesium sulphate and then the solvent removed in vacuo.
  • the product was purified using column chromatography with dichlormethane:hexanes (50:50) as the mobile phase.
  • triphenylene examples can be synthesized by one skilled in the art via Suzuki coupling with the corresponding halotriphenylene and arylboronic acids.
  • 1,1-Bistriphenylene can be synthesized according to Organometallics, 2004, 23, 3079
  • the solid was washed with copious amount of methanol, then hexanes. The solid was then recrystallized from 80 ml of xylenes. Final purification of the product involved subliming the material at 250° C. 0.35 g product was collected as white needle crystals.
  • the flask was then removed from the ice bath and stirred at room temperature for one hour followed by heating at 55° C. for 2 hours. The mixture was then cooled, the solvent removed in vacuo and the product column chromatographed using hexanes/dichloromethane (10%/90%) to give 0.36 g (60%) of the product.
  • the compound having the structure above can be synthesized according to Angew. Chem., Int. Ed. Engl., 1996, 35, 886.
  • triphenylenylene and arylenetriphenylene examples can be synthesized by one skilled in the art via the coupling of 1 or 2-bromotriphenylene and 4,4,5,5-tetramethyl-2-(1 or 2-triphenylene)-1,3,2-dioxaborolane which can be prepared according to the aforementioned synthetic schemes.
  • Poly(2-vinyltriphenylene) can be synthesized by the following scheme based on synthetic chemistry commonly used by those skilled in the art.
  • Poly[2-(4-vinylphenyl)triphenylene] can be synthesized according to following scheme based on synthetic chemistry commonly used by those skilled in the art.
  • Poly(2,7-triphenylene) can be synthesized according to following scheme based on synthetic chemistry commonly used by those skilled in the art.
  • Poly(2,7-triphenylenylene-1,4-phenylene can be synthesized according to following scheme based on synthetic chemistry commonly used by those skilled in the art.
  • the compound having the structure above can be synthesized according to J. Org. Chem., 1996, 61, 7198.
  • the compound having the structure above can be synthesized according to Org. Lett., 2000, 2, 1629.
  • 1,12-fused-bistriphenylene can be synthesized according to Organometallics, 2004, 23, 3079.
  • 1,12-fused-tetratriphenylene may be synthesized according to following scheme.
  • substituted precursors can be used to synthesize substituted triphenylene products which may offer different properties than unsubstantiated analogs such as higher solubility, lower evaporation temperature, higher/lower HOMO/LUMO energy levels which may be advantageous in specific device fabrication, architecture and application.
  • All devices were fabricated by high vacuum ( ⁇ 10 ⁇ 7 Torre) thermal evaporation.
  • the anode electrode is ⁇ 1200 ⁇ of indium tin oxide (ITO).
  • the cathode consists of 10 ⁇ of LiF followed by 1,000 ⁇ of Al. All devices are encapsulated with a glass lid sealed with an epoxy resin in a nitrogen glove box ( ⁇ 1 pap of H 2 O and O 2 ) immediately after fabrication, and a moisture getter was incorporated inside the package.
  • the organic stack consists of sequentially, from the ITO surface, 100 ⁇ thick of copper phthalocyanine (CuPc) as the hole injection layer (HIL), 300 ⁇ of 4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl ( ⁇ -NPD), as the hole transporting layer (HTL), 300 ⁇ of the triphenylene compounds or the comparative compounds doped with 6 or 12 wt % of the dopant emitter as the emissive layer (EML).
  • CuPc copper phthalocyanine
  • HIL hole injection layer
  • ⁇ -NPD 4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl
  • HTL hole transporting layer
  • EML emissive layer
  • Device Examples 1, 4, 7, 10, 13, 16 and 22 and Comparative Device Examples 1, 2, 3, & 4 consist of 100-150 ⁇ of aluminum(III)bis(2-methyl-8-hydroxyquinolinato)4-phenylphenolate (BAlq) as the ETL2 and 400-500 ⁇ of tris(8-hydroxyquinolinato)aluminum (Alq 3 ) as the ETL1.
  • Device Examples 2, 5, 8, 11, 14, 19, 20, 21 and 23 and Comparative Device Examples 5 & 6 consist of 50-150 ⁇ of HPT as the ETL2 and 400-500 ⁇ of Alq 3 as the ETL1.
  • Device Examples 3, 6, 9, 12, 15 and 18 consist of 400-500 ⁇ of Alq 3 as the ETL2 with no ETL1.
  • the exact ETL layer thicknesses are shown in Table 2. Structures for HPT and 2,2-BT and additional examples of triphenylene compounds suitable as host materials are shown in FIG. 17 .
  • the triphenylene compounds show high device efficiency as host materials. Devices with HPT as the host show comparable or higher efficiency than those with the comparative compound CBP as the host.
  • the current-voltage-luminance (IVL) characteristics and operational stabilities were measured for selected devices and are depicted in FIGS. 3-16 and FIGS. 18-31 .
  • the lifetimes of the devices with triphenylene hosts are comparable to those with the comparative compound CBP as the host.
  • Phosphorescent devices with very high device efficiency are highly desirable in applications such as display, lighting, etc. For full color and lighting application, high operational stability in red, green and blue colors is essential. Due to the high triplet energy nature of blue phosphorescent dopant emitters, high triplet energy host materials are required so that high device efficiency can be obtained.
  • polyaromatic compounds with extended 7 ⁇ -conjugation usually show respectable lifetimes. However, polyaromatic compounds with extended ⁇ -conjugation usually have low triplet energy also. For example, anthracene has a triplet energy of 1.8 eV which is lower than those of red phosphorescent dopants such as Ir(1-piq) 2 (acac).
  • a device with an anthracene compound as the host with Ir(1-piq) 2 (acac) as the dopant emitter is very inefficient, because of quenching. Reducing one fused phenyl ring from anthracene gives naphthalene which is the smallest fused polyaromatic compound. Yet it still has a triplet energy of 2.6 eV which is lower than those of deep blue phosphorescent dopants such as Ir(4,6-F 2 -5CNppy) 3 .
  • triphenylene despite its four fused ring configuration, has a triplet energy of 2.9 eV which is believed to be suitable for deep blue phosphorescent dopants such as Ir(4,6-F 2 -5CNppy) 3 .
  • Triphenylene can be derivatized in various ways such as adding alkyl or aryl groups, linking multiple or fusing triphenylenes through different positions to modulate the electronic properties (e.g. conjugation, triplet energy, HOMO/LUMO levels, etc), structure properties (e.g., planar, non-planar, chirality), and physical properties (e.g., sublimation temperature, solubility).
  • triphenylene compounds provides relatively large degree of ⁇ -conjugation but relatively high triplet energy renders them very suitable for stable and high-efficiency PHOLEDs.
  • hexaphenyltriphenylene (HPT) as a host for red dopant Ir(3-Mepq) 2 (acac) and Ir(1-piq) 3 gives efficient and highly stable devices as shown in FIGS. 3-5 and 6 - 8 respectively.

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